linux-kernel - Re: [PATCH] dt-bindings: arm: mediatek: mmsys: change compatible for MT8195

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Date:   Thu, 25 Aug 2022 15:03:41 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>
Cc:     Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        CK Hu (胡俊光) <ck.hu@...iatek.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "hsinyi@...gle.com" <hsinyi@...gle.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH] dt-bindings: arm: mediatek: mmsys: change compatible for
 MT8195



On 25/08/2022 13:06, Bo-Chen Chen wrote:
> On Thu, 2022-08-25 at 18:55 +0800, Matthias Brugger wrote:
>>
>> On 25/08/2022 08:59, Bo-Chen Chen wrote:
>>> On Thu, 2022-08-25 at 14:11 +0800, Krzysztof Kozlowski wrote:
>>>> On 25/08/2022 08:56, Bo-Chen Chen wrote:
>>>>> From: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
>>>>>
>>>>> For previous MediaTek SoCs, such as MT8173, there are 2 display
>>>>> HW
>>>>> pipelines binding to 1 mmsys with the same power domain, the
>>>>> same
>>>>> clock driver and the same mediatek-drm driver.
>>>>>
>>>>> For MT8195, VDOSYS0 and VDOSYS1 are 2 display HW pipelines
>>>>> binding
>>>>> to
>>>>> 2 different power domains, different clock drivers and
>>>>> different
>>>>> mediatek-drm drivers.
>>
>> drop clock driver example here.
>>
> 
> Hello Matthias,
> 
> Thanks for your review.
> I am not sure what do you mean.
> Could you explain more detailedly?
> 

Never mind, it's not that important.

Regards,
Matthias

>>>>
>>>> I don't see binding to different clock drivers and anyway that's
>>>> not
>>>> really an argument here. Please focus in description on hardware
>>>> properties, IOW, are devices compatible or different. What is the
>>>> incompatible difference between VDOSYS0 and 1?
>>>>
>>>> Best regards,
>>>> Krzysztof
>>>
>>> Hello Krzysztof,
>>>
>>> Thanks for yor review.
>>>
>>>   From the functions perspective:
>>>
>>> Hardware pipeline of VDOSYS0 has these components: COLOR, CCORR,
>>> AAL,
>>> GAMMA, DITHER.
>>> They are related to PQ (Picture Quality) functions and they makes
>>> VDOSYS0 supports PQ function while they are not including in
>>> VDOSYS1.
>>>
>>> Hardware pipeline of VDOSYS1 has the component ETHDR (HDR related
>>> component).
>>> It makes VDOSYS1 supports the HDR function while it's not including
>>> in
>>> VDOSYS0.
>>>
>>
>> Please include a description of this in the commit message.
>>
> 
> Yes, I have sent v2 and add these to commit meesage.
> 
> https://lore.kernel.org/all/20220825091448.14008-1-rex-bc.chen@mediatek.com/
> 
> BRs,
> Bo-chen
> 
>>> About mediatek ETHDR, you can refer to this series:
>>>
>>>
> https://lore.kernel.org/all/20220819061456.8042-2-nancy.lin@mediatek.com/
>>>
>>> To summary:
>>> Only VDOSYS0 can support PQ adjustment.
>>> Only VDOSYS1 can support HDR adjustment.
>>>
>>> Is this description ok for you?
>>> If it is ok, I will put them into commit message in next version.
>>>
>>> BRs,
>>> Bo-Chen
>>>
>